Boise weather in August
Temperature, rain and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: May – June, September – October
What is the weather like in Boise in August?
In August, Boise is hot: daytime highs average 32 °C, and nights cool down to about 18 °C. With around 11 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 23 days the thermometer climbs to 30 °C or more. All in all, August is a good month for a holiday in Boise.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 59 | 68 | 100 |
| Day | 34° | 32° | 26° |
| Night | 19° | 18° | 13° |
| Sun | 12 h | 11 h | 9 h |
| Rain days | 1 | 1 | 2 |
More details for August
- Daylight
- 14 h 2 min06:49 – 20:51
- UV index
- 8 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 14 km/haverage daily peakAll months
- Cloud cover
- 22 %on averageAll months
- Hot days
- 23 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−6America/Boise
How the score comes together
- Temperatureweight 50 %36 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
Boise in August: quick answers
Is Boise hot in August?
Yes. In August, Boise is hot: daytime highs average 32 °C and nights stay around 18 °C. On about 23 days the thermometer climbs to 30 °C or more.
Does it rain much in Boise in August?
It hardly ever rains.
Boise month by month
The whole year in BoiseAll destinations: USAWhere to go in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences